The objective of this paper is to evaluate the geotechnical performance of a clay soil of high plasticity added with recycled brick powder (RBP) and recycled gypsum powder (RGP), both obtained in “waste” condition. In order to classify the soil, in its natural state, as a clay of high plasticity, the tests of moisture content, granulometry and consistency limits were performed. Subsequently, soil samples were prepared with the two additives proposed in percentages of 2.5 %, 5 % and 7.5 % of RGP and 5 %, 10 % and 15 % of RBP. This is in order to evaluate its influence on the dry density and unconfined compressive strength of the soil. Laboratory test results have demonstrated that the inclusion of RGP and RBP produce an increase of up to 7.5 % in soil density and 13.5 % in the optimum soil moisture content compared to the values obtained from natural soil without additions. Furthermore, unconfined compressive strength increased from an average value of 6.3 kg/cm2 to 28.8 kg/cm2. These results reflect that the higher the RBP and RGP addition content in the soil, the higher the soil's resistance to compression forces.